Process for controlling quality of yarns

Details Process for controlling quality of yarns Process for controlling quality of yarns

1988-08-31

1990-09-04

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264211, D01F 102, D01F 658

Patent

active

049543024

ABSTRACT:
A process for controlling the relative viscosity of synthetic yarns during production thereof. At least three pressure measurements are taken at three spaced locations in a transfer line for carrying molten polymer to a spinneret. Temperature and throughput of polymer in said transfer line are measured. An estimated relative viscosity of yarn produced by employing a predetermined correlation between pressure drop, throughput, temperature and relative viscosity is then calculated. A meaningful operating condition in the melting zone is adjusted in response to deviations in the estimated relative viscosity of said yarn from a desired relative viscosity of said yarn.

REFERENCES:
patent: 3992239 (1926-11-01), Schroeder
patent: 4089727 (1978-05-01), McLain
patent: 4369934 (1983-01-01), Spies
patent: 4412965 (1983-11-01), Thompson et al.
patent: 4675378 (1987-06-01), Gibbon et al.

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